Loans and Leases - Balances of Commercial Loan Portfolio Classes, Disaggregated by PD Grade and FICO Score - Prior Year (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 64,377	$ 64,156
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1,299	4,551
2024	4,540	5,265
2023	4,979	2,146
2022	2,050	2,991
2021	2,807	1,931
Prior to 2021	5,866	4,240
LMC	4,641	4,703
Revolving Loans	10,032	9,854
Revolving Loans Converted to Term Loans	253	224
Loans and leases	36,467	35,905
Commercial | Commercial and industrial | PD Grade 1 -12
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1,284	4,492
2024	4,441	5,124
2023	4,788	2,012
2022	1,881	2,706
2021	2,536	1,749
Prior to 2021	5,465	3,997
LMC	4,614	4,703
Revolving Loans	9,642	9,448
Revolving Loans Converted to Term Loans	239	210
Loans and leases	34,890	34,441
Commercial | Commercial and industrial | PD Grades 13
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	2	7
2024	19	55
2023	79	42
2022	61	78
2021	32	30
Prior to 2021	81	61
LMC	27	0
Revolving Loans	94	123
Revolving Loans Converted to Term Loans	7	6
Loans and leases	402	402
Commercial | Commercial and industrial | PD Grades 14 15 16
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	13	52
2024	80	86
2023	112	92
2022	108	207
2021	239	152
Prior to 2021	320	182
LMC	0	0
Revolving Loans	296	283
Revolving Loans Converted to Term Loans	7	8
Loans and leases	1,175	1,062
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,420	13,563
Commercial | Commercial real estate | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	429	1,372
2024	1,484	1,022
2023	988	1,736
2022	1,717	2,985
2021	2,688	2,117
Prior to 2021	5,713	3,866
Revolving Loans	340	372
Revolving Loans Converted to Term Loans	61	93
Loans and leases	13,420	13,563
Commercial | Commercial real estate | PD Grade 1 -12 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	429	1,362
2024	1,480	1,011
2023	975	1,726
2022	1,600	2,314
2021	2,189	1,873
Prior to 2021	5,128	3,457
Revolving Loans	305	293
Revolving Loans Converted to Term Loans	61	93
Loans and leases	12,167	12,129
Commercial | Commercial real estate | PD Grades 13 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	0
2024	0	0
2023	0	1
2022	68	191
2021	92	92
Prior to 2021	85	88
Revolving Loans	3	33
Revolving Loans Converted to Term Loans	0	0
Loans and leases	248	405
Commercial | Commercial real estate | PD Grades 14 15 16 | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	10
2024	4	11
2023	13	9
2022	49	480
2021	407	152
Prior to 2021	500	321
Revolving Loans	32	46
Revolving Loans Converted to Term Loans	0	0
Loans and leases	1,005	1,029
Commercial | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	157	143
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,928	14,108
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	219	1,259
2024	1,234	1,315
2023	1,233	1,803
2022	1,718	2,480
2021	2,416	1,913
Prior to 2021	4,945	3,174
Revolving Loans	2,017	2,019
Revolving Loans Converted to Term Loans	146	145
Loans and leases	13,928	14,108
Consumer | Consumer Real Estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	156	920
2024	928	922
2023	987	1,330
2022	1,398	1,830
2021	2,033	1,430
Prior to 2021	3,916	1,924
Revolving Loans	1,508	1,551
Revolving Loans Converted to Term Loans	69	75
Loans and leases	10,995	9,982
Consumer | Consumer Real Estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	20	119
2024	97	139
2023	80	173
2022	88	250
2021	112	193
Prior to 2021	267	324
Revolving Loans	154	182
Revolving Loans Converted to Term Loans	12	17
Loans and leases	830	1,397
Consumer | Consumer Real Estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	24	94
2024	69	90
2023	45	125
2022	65	202
2021	85	159
Prior to 2021	210	250
Revolving Loans	137	134
Revolving Loans Converted to Term Loans	11	14
Loans and leases	646	1,068
Consumer | Consumer Real Estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	13	92
2024	84	128
2023	56	145
2022	93	163
2021	113	90
Prior to 2021	248	268
Revolving Loans	141	115
Revolving Loans Converted to Term Loans	22	19
Loans and leases	770	1,020
Consumer | Consumer Real Estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	1	9
2024	27	11
2023	35	10
2022	30	16
2021	26	18
Prior to 2021	115	102
Revolving Loans	36	22
Revolving Loans Converted to Term Loans	9	5
Loans and leases	279	193
Consumer | Consumer Real Estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	5	25
2024	29	25
2023	30	20
2022	44	19
2021	47	23
Prior to 2021	189	306
Revolving Loans	41	15
Revolving Loans Converted to Term Loans	23	15
Loans and leases	408	448
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	6	36
2024	37	15
2023	16	13
2022	14	7
2021	6	4
Prior to 2021	68	58
Revolving Loans	403	437
Revolving Loans Converted to Term Loans	12	10
Loans and leases	562	580
Consumer | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	3	25
2024	25	8
2023	8	8
2022	8	3
2021	3	2
Prior to 2021	14	8
Revolving Loans	199	197
Revolving Loans Converted to Term Loans	6	6
Loans and leases	266	257
Consumer | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	2
2024	1	1
2023	1	1
2022	0	0
2021	1	0
Prior to 2021	3	1
Revolving Loans	22	13
Revolving Loans Converted to Term Loans	1	1
Loans and leases	29	19
Consumer | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	2
2024	3	1
2023	1	0
2022	1	1
2021	0	0
Prior to 2021	2	0
Revolving Loans	25	12
Revolving Loans Converted to Term Loans	1	1
Loans and leases	33	17
Consumer | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	1
2024	1	0
2023	1	0
2022	1	0
2021	0	0
Prior to 2021	3	1
Revolving Loans	24	6
Revolving Loans Converted to Term Loans	2	1
Loans and leases	32	9
Consumer | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	0	1
2024	1	1
2023	1	0
2022	0	0
2021	0	0
Prior to 2021	1	0
Revolving Loans	14	7
Revolving Loans Converted to Term Loans	1	1
Loans and leases	18	10
Consumer | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
2025	3	5
2024	6	4
2023	4	4
2022	4	3
2021	2	2
Prior to 2021	45	48
Revolving Loans	119	202
Revolving Loans Converted to Term Loans	1	0
Loans and leases	$ 184	$ 268